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  • Plumbing the Drain for a Dual Sink Vanity

    Is this a correct way to plumb the drains for a two sink vanity?

    More specifically:

    Would it have been better to use a San T rather than the Wye T?

    Will I need to use internal vents for each sink, or can they share the original vent on the right side of the stack?

    It was plumbed by a friend, but I want a second opinion before I close up the walls.

    *I'm only concerned about the horizontal portions because I am in a condo high rise. We decided to bubble out into the cabinet rather than cut into the waste stack because there are at least 6 bathroom sinks above me that use that same waste line. There was not enough space in the wall to keep it all in the wall.
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  • #2
    Re: Plumbing the Drain for a Dual Sink Vanity

    What did your Inspector think of the work?

    Mark
    "Somewhere a Village is Missing Twelve Idiots!" - Casey Anthony

    I never lost a cent on the jobs I didn't get!

    Comment


    • #3
      Re: Plumbing the Drain for a Dual Sink Vanity

      The inspector didn't comment on it, but he spent most of his time looking at the rest of the project, which passed rough-in.

      I'm also pursuing this question out of mere curiosity. Personally, I think it will work, but wouldn't a san T be smoother/recommended?

      Comment


      • #4
        Re: Plumbing the Drain for a Dual Sink Vanity

        How did that pass inspection? You have 2 fixtures behind a vent there.

        No offense byuanimal, but your friend should never attempt to do Plumbing again, and your inspector should be fired for being incompetent.

        Comment


        • #5
          Re: Plumbing the Drain for a Dual Sink Vanity

          Wow! Thanks for the warning. Maybe my concerns were well founded. I will need to have someone else come fix it.

          Any recommendations? Could it work if we add some internal vents? Maybe we're running into some space/technical limitations.

          Comment


          • #6
            Re: Plumbing the Drain for a Dual Sink Vanity

            Up at the cieling it looks like a 3" duct comes across in fron of the waste and vent stack and is still inside the wall. That should be enough room to cross over with a 1-1/2" ABS pipe.

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            • #7
              Re: Plumbing the Drain for a Dual Sink Vanity

              The duct had to be squashed a little around those pipes, but we probably have room for the ABS vent, assuming we can get around that waste pipe. I think my friend was thinking it was close enough to the right sink's vent that it would be okay, apparently not.

              What else should I make sure the new plumber fixes? The responses received thus far are suggesting this guy had no idea what he was doing.

              Comment


              • #8
                Re: Plumbing the Drain for a Dual Sink Vanity

                Your pictures make it hard to judge sizes or distances. If the sinks are really close you may want to consider a two part waste with end outlet. If they are further apart you may need to figure out a wet vent or a double san-tee. Either way two traps on a single sanitary tee will not fly.

                Mark
                "Somewhere a Village is Missing Twelve Idiots!" - Casey Anthony

                I never lost a cent on the jobs I didn't get!

                Comment


                • #9
                  Re: Plumbing the Drain for a Dual Sink Vanity

                  Originally posted by ToUtahNow View Post
                  Your pictures make it hard to judge sizes or distances. If the sinks are really close you may want to consider a two part waste with end outlet. If they are further apart you may need to figure out a wet vent or a double san-tee. Either way two traps on a single sanitary tee will not fly.

                  Mark
                  Mark, I.P.C. allows 2 traps (lav) on a single sanitary tee because the D.f.U. is 1 for 1 1/4" traps.

                  Even though the line is 1-1/2" (looks like 1-1/2" in the picture) with a maximum 2 dfu, he's connecting into what looks like 2" and that allows 4 D.F.U's if I'm correct.

                  This picture here just needs a back vent in between both fixture drain outlets.

                  Comment


                  • #10
                    Re: Plumbing the Drain for a Dual Sink Vanity

                    This is interesting . The Guys over at the plumbing Zone, love a challenge like this!
                    I can build anything You want , if you draw a picture of it , on the back of a big enough check .

                    Comment


                    • #11
                      Re: Plumbing the Drain for a Dual Sink Vanity

                      Originally posted by Flux View Post
                      This picture here just needs a back vent in between both fixture drain outlets.
                      You're right. It is all 1.5" pipe except for the vent, waste, and crossover - which are 2".

                      If we can run 1.5" ABS from the crossover (just above the existing double san-tee) to the left sink, will that solve our problem?

                      Comment


                      • #12
                        Re: Plumbing the Drain for a Dual Sink Vanity

                        Originally posted by toolaholic View Post
                        This is interesting . The Guys over at the plumbing Zone, love a challenge like this!
                        So those guys want to battle? Count me in for a good old fashion bench brawl j/k

                        Comment


                        • #13
                          Re: Plumbing the Drain for a Dual Sink Vanity

                          Originally posted by Flux View Post
                          So those guys want to battle? Count me in for a good old fashion bench brawl j/k
                          This Irishman loves to stir the pot ! Glad You have My back Brothers !
                          I can build anything You want , if you draw a picture of it , on the back of a big enough check .

                          Comment

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